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 Does usernames actually matter on Nostr? Or is it just the public key what matters?
Are usernames unique? Can 2 accounts have the same name?
#nostr #newbie #introductions 
 It's not an account, so usernames are a poor terminology. You aren't a "user" of a platform. Its more like a handle so people can search you by a name with an @ sign. So yes many people can have the same username but nobody else has your npub.
With nostr, your npub is the platform. 
 On Nostr you are your npub you are not your username.
There is also your nip-05 that identifies you in case someone else wants to impersonate you.
For example my nip-05 is :
isolabellart@nsec.app 
And no one else can have it like it because it's tied to my npub. 
 Ohh. How can I get one of those. 
 Usernames don’t matter.  It is just easier for friends to recognize you.  You can change it as often as you want.
Pubkey and nsec (private) key are the only things that really matter.  Do not give your nsec to anyone. 
 Yes